Understanding Atomic Structure

Front

Atom

Back

Smallest unit of matter

Front

Nucleus

Back

Center of an atom, contains protons and neutrons

Front

Proton

Back

Positively charged particle in the nucleus

Front

Neutron

Back

Neutral particle in the nucleus

Front

Electron

Back

Negatively charged particle orbiting the nucleus

Front

Atomic Number

Back

Number of protons in an atom

Front

Mass Number

Back

Sum of protons and neutrons in an atom

Front

Isotope

Back

Atoms with same number of protons, different neutrons

Front

Electron Shell

Back

Energy levels where electrons are found

Front

Valence Electrons

Back

Electrons in the outermost shell